evolve: revision graph

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prune: use action "prune", not "touch", in precheck stable
Mon, 25 Mar 2019 15:44:44 -0700, by Martin von Zweigbergk
evolve: test a common case of public divergence
Sun, 24 Mar 2019 21:30:12 +0530, by Pierre-Yves David
evolve: add condition in case of pubdiv to not swap the two div csets
Sun, 24 Mar 2019 21:29:44 +0530, by Sushil khanchi

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